John Cena’s “nude” 2024 Oscars skit — and said ABC execs were “terrified” over the idea.In his “Jimmy Kimmel Live!” monologue Monday night, the 96th Academy Awards master of ceremonies gave a post-mortem on the previous night’s ceremony, in which Cena, 46, memorably appeared onstage— with nothing but a strategically placed envelope covering his penis — to present the award for Best Costume.It was an homage of sorts to the incident 50 years earlier, at the 1974 Oscars, when a naked streaker ran onto the stage behind David Niven on live television.“Getting this on the air . .